Pcm Code E040, Open PSPS Circuit: Description
WARNING: This page is about a different car, the 1992 Cadillac Seville and 1992 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.
This code test monitors power steering pressure switch. When a load is placed on power steering, such as full lock, switch opens. PCM Code E040 sets when vehicle speed is greater than 45 MPH and pressure switch is open.